dd-wrt reset wan IP if internet isn't working

check-wan.sh

#!/bin/bash
echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1
if [ $? -eq 0 ]; then
    echo `date` " - Internet OK - IP:" `ifconfig vlan2 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*'` >> /tmp/script.out
    exit 0
else
	echo `date` " - Internet NOK - IP:" `ifconfig vlan2 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*'` >> /tmp/script.out
	killall -SIGUSR1 udhcpc
	killall -SIGUSR2 udhcpc
	sleep 600
fi